--- Time.xmlschema(date)
--- Time.iso8601(date)
    XML Schema ƤdateTimeȤdateѡ
    Time֥ȤѴޤ

    dateISO 8601Ƥ˽򤷤Ƥʤޤ
    Time饹ꤵ줿ɽǤʤȤArgumentError
    ȯޤ

